In Lee Denhams's Mahler First survey, he gave Walter's performance a 9/10, in spite of slightly compromised sound. The good news is that recording has just been revisited by Restoration Archive, resulting in a completely fresh sounding reissue, to my ears.

I don't know if MusicWeb will ever review YouTube-posted restorations, but if ever one deserved such a review, it's this one, IMHO.

And @Lee, thanks so much for your survey, a true labor of love I refer to frequently.